[binutils-gdb] [gdb/testsuite] Fix gdb.threads/watchpoint-fork.exp race
Tom de Vries
vries@sourceware.org
Wed Jan 29 07:49:00 GMT 2020
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=ee2a6fc60413a2f5bc6641fd6d06f460c9deab3f
commit ee2a6fc60413a2f5bc6641fd6d06f460c9deab3f
Author: Tom de Vries <tdevries@suse.de>
Date: Wed Jan 29 08:48:53 2020 +0100
[gdb/testsuite] Fix gdb.threads/watchpoint-fork.exp race
I ran into:
...
Thread 3.1 "watchpoint-fork" hit Breakpoint 3, marker () at \
watchpoint-fork-mt.c:42^M
42 }^M
(gdb) parent2: 1945^M
FAIL: gdb.threads/watchpoint-fork.exp: child: multithreaded: breakpoint (A) \
after the second fork (timeout)
...
The problem is that the FAILing gdb_test expects '(gdb) ' to be the last thing
printed, but the inferior prints something after that.
A similar FAIL is described in the sources in watchpoint-fork-parent.c:
...
printf ("child%d: %d\n", nr, (int) getpid ());
/* Delay to get both the "child%d" and "parent%d" message printed
without a race breaking expect by its endless wait on `$gdb_prompt$':
Breakpoint 3, marker () at watchpoint-fork.c:33
33 }
(gdb) parent2: 14223 */
i = sleep (1);
...
I noticed that while the executables print output, the output is not verified in
the test-case, so it's merely debug output.
Fix this by:
- guarding the prints in the executables (as well as related
sleep and setbuf calls) with #if DEBUG, and
- compiling by default with DEBUG=0.
gdb/testsuite/ChangeLog:
2020-01-29 Tom de Vries <tdevries@suse.de>
* gdb.threads/watchpoint-fork-child.c: Guard prints with #if DEBUG.
* gdb.threads/watchpoint-fork-mt.c: Same.
* gdb.threads/watchpoint-fork-parent.c: Same.
* gdb.threads/watchpoint-fork-st.c: Same.
* gdb.threads/watchpoint-fork.exp: Compile with DEBUG=0.
Change-Id: I63efd4c7771f96b5f5cd87ef2ab36795484ae2be
Diff:
---
gdb/testsuite/ChangeLog | 8 ++++++++
gdb/testsuite/gdb.threads/watchpoint-fork-child.c | 4 ++++
gdb/testsuite/gdb.threads/watchpoint-fork-mt.c | 2 ++
gdb/testsuite/gdb.threads/watchpoint-fork-parent.c | 4 ++++
gdb/testsuite/gdb.threads/watchpoint-fork-st.c | 2 ++
gdb/testsuite/gdb.threads/watchpoint-fork.exp | 13 +++++++++++--
6 files changed, 31 insertions(+), 2 deletions(-)
diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index 4fd5dc8..6559b7d 100644
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,3 +1,11 @@
+2020-01-29 Tom de Vries <tdevries@suse.de>
+
+ * gdb.threads/watchpoint-fork-child.c: Guard prints with #if DEBUG.
+ * gdb.threads/watchpoint-fork-mt.c: Same.
+ * gdb.threads/watchpoint-fork-parent.c: Same.
+ * gdb.threads/watchpoint-fork-st.c: Same.
+ * gdb.threads/watchpoint-fork.exp: Compile with DEBUG=0.
+
2020-01-27 Luis Machado <luis.machado@linaro.org>
* gdb.base/step-over-syscall.exp (setup): Check if we're already
diff --git a/gdb/testsuite/gdb.threads/watchpoint-fork-child.c b/gdb/testsuite/gdb.threads/watchpoint-fork-child.c
index 1da75c9..96860bb 100644
--- a/gdb/testsuite/gdb.threads/watchpoint-fork-child.c
+++ b/gdb/testsuite/gdb.threads/watchpoint-fork-child.c
@@ -59,7 +59,9 @@ forkoff (int nr)
case -1:
assert (0);
default:
+#if DEBUG
printf ("parent%d: %d\n", nr, (int) child);
+#endif
/* Sleep for a while to possibly get incorrectly ATTACH_THREADed by GDB
tracing the child fork with no longer valid thread/lwp entries of the
@@ -95,7 +97,9 @@ forkoff (int nr)
_exit (0);
case 0:
+#if DEBUG
printf ("child%d: %d\n", nr, (int) getpid ());
+#endif
/* Let the parent signal us about its success. Be careful of races. */
diff --git a/gdb/testsuite/gdb.threads/watchpoint-fork-mt.c b/gdb/testsuite/gdb.threads/watchpoint-fork-mt.c
index 4b195f97..7b1bbf4 100644
--- a/gdb/testsuite/gdb.threads/watchpoint-fork-mt.c
+++ b/gdb/testsuite/gdb.threads/watchpoint-fork-mt.c
@@ -114,8 +114,10 @@ main (void)
int i;
void *thread_result;
+#if DEBUG
setbuf (stdout, NULL);
printf ("main: %d\n", (int) gettid ());
+#endif
/* General hardware breakpoints and watchpoints validity. */
marker ();
diff --git a/gdb/testsuite/gdb.threads/watchpoint-fork-parent.c b/gdb/testsuite/gdb.threads/watchpoint-fork-parent.c
index 511c951..2b325b0 100644
--- a/gdb/testsuite/gdb.threads/watchpoint-fork-parent.c
+++ b/gdb/testsuite/gdb.threads/watchpoint-fork-parent.c
@@ -40,6 +40,7 @@ forkoff (int nr)
case -1:
assert (0);
case 0:
+#if DEBUG
printf ("child%d: %d\n", nr, (int) getpid ());
/* Delay to get both the "child%d" and "parent%d" message printed without
a race breaking expect by its endless wait on `$gdb_prompt$':
@@ -48,6 +49,7 @@ forkoff (int nr)
(gdb) parent2: 14223 */
i = sleep (1);
assert (i == 0);
+#endif
/* We must not get caught here (against a forgotten breakpoint). */
var++;
@@ -55,11 +57,13 @@ forkoff (int nr)
_exit (exit_code);
default:
+#if DEBUG
printf ("parent%d: %d\n", nr, (int) child);
/* Delay to get both the "child%d" and "parent%d" message printed, see
above. */
i = sleep (1);
assert (i == 0);
+#endif
pid_got = wait (&status);
assert (pid_got == child);
diff --git a/gdb/testsuite/gdb.threads/watchpoint-fork-st.c b/gdb/testsuite/gdb.threads/watchpoint-fork-st.c
index b75deb6..8a7caec 100644
--- a/gdb/testsuite/gdb.threads/watchpoint-fork-st.c
+++ b/gdb/testsuite/gdb.threads/watchpoint-fork-st.c
@@ -40,8 +40,10 @@ mark_exit (void)
int
main (void)
{
+#if DEBUG
setbuf (stdout, NULL);
printf ("main: %d\n", (int) getpid ());
+#endif
/* General hardware breakpoints and watchpoints validity. */
marker ();
diff --git a/gdb/testsuite/gdb.threads/watchpoint-fork.exp b/gdb/testsuite/gdb.threads/watchpoint-fork.exp
index 5f38fca..6500c0d 100644
--- a/gdb/testsuite/gdb.threads/watchpoint-fork.exp
+++ b/gdb/testsuite/gdb.threads/watchpoint-fork.exp
@@ -17,7 +17,11 @@
set testfile watchpoint-fork
+# Set DEBUG to 0 or 1 in sources
+set debug 0
+
proc test {type symbol} {
+ global debug
with_test_prefix "$type" {
global testfile subdir srcdir gdb_prompt
@@ -30,7 +34,8 @@ proc test {type symbol} {
set srcfile_main ${testfile}-st.c
if {[build_executable $testfile.exp $executable \
[list $srcfile_main ${testfile}-${type}.c] \
- [list debug additional_flags=-D$symbol]] == -1} {
+ [list debug additional_flags=-D$symbol \
+ additional_flags=-DDEBUG=$debug]] == -1} {
return -1
}
@@ -96,7 +101,11 @@ proc test {type symbol} {
with_test_prefix "multithreaded" {
set executable ${testfile}-${type}-mt
set srcfile_main ${srcdir}/${subdir}/${testfile}-mt.c
- if { [gdb_compile_pthreads "${srcfile_main} ${srcfile_type}" [standard_output_file ${executable}] executable [list debug "additional_flags=-D$symbol -DTHREAD"]] != "" } {
+ if { [gdb_compile_pthreads "${srcfile_main} ${srcfile_type}" \
+ [standard_output_file ${executable}] executable \
+ [list debug "additional_flags=-D$symbol" \
+ "additional_flags=-DDEBUG=$debug" \
+ "-DTHREAD"]] != "" } {
untested "failed to compile"
return
}
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